Computational analysis of the photograph of the artwork C minor - Research on Harmony (AQC0583) [1] by Arnaud Quercy [2], according to IDS-CMP-2025 [3], on an image 1000 pixels on its longer side, on 2025-10-03. Each colour is located in the Munsell system and named according to the ISCC-NBS system (267 names, National Bureau of Standards, 1976). The image divides into 10 flat areas. The largest are moderate yellowish pink (40%), deep reddish orange (14%) and deep violet (13%). Among the others, those that stand out most sharply from their surroundings are yellowish gray in the centre (0.5%), dark brown at the bottom (13%) and grayish yellow at the bottom (10%). By colour name family: pink 30%, brown 23%, red 17%, violet 12%, orange 7.8%, yellow 5.3% and olive brown 2.2%.
Context
Analysis performed according to IDS-CMP-2025 [3]: (a) colours named by Munsell and ISCC-NBS, areas and flat areas, (b) texture, (c) brightness and contrast, (d) spatial distribution. Source image: 2425x3074 pixels. Analysis date: 2025-10-03.
A) Color Analysis
Flat areas
Ranked by contrast with their surroundings (CIEDE2000). Strokes thinner than 10 pixels are excluded (2).
| Rank |
Colour |
ISCC-NBS name |
Munsell |
Area |
Contrast |
Position |
| 1 |
BEB9AC |
yellowish gray |
0.9GY 7.5/1.0 |
0.5% |
58.5 |
in the centre |
| 2 |
270B47 |
deep violet |
0.1P 0.9/7.8 |
13% |
49.9 |
at the top |
| 3 |
32100B |
dark brown |
3.8YR 1.1/3.1 |
13% |
47.6 |
at the bottom |
| 4 |
A12A0A |
deep reddish orange |
0.1YR 3.7/11.7 |
14% |
34.5 |
on the left |
| 5 |
CB908C |
moderate yellowish pink |
6.8R 6.5/5.0 |
40% |
33.6 |
in the centre |
| 6 |
B3A282 |
grayish yellow |
2.6Y 6.7/2.6 |
10% |
25.2 |
at the bottom |
| 7 |
976E63 |
light reddish brown |
8.8R 4.8/3.5 |
0.2% |
12.7 |
at the bottom left |
| 8 |
A56866 |
grayish red |
7.4R 5.0/5.0 |
8.4% |
7.0 |
at the bottom right |
| 9 |
B99282 |
light reddish brown |
1.6YR 6.4/3.6 |
0.2% |
2.9 |
on the right |
| 10 |
64302F |
moderate reddish brown |
0.1YR 2.7/4.4 |
0.1% |
2.7 |
at the bottom left |
Colour name families
| Family |
Area |
| pink |
30% |
| brown |
23% |
| red |
17% |
| violet |
12% |
| orange |
7.8% |
| yellow |
5.3% |
| olive brown |
2.2% |
| gray |
0.6% |
B) Texture Analysis
| Metric |
Value |
| Global Roughness |
0.241 |
| Mean Local Roughness |
0.017 |
| Roughness Uniformity |
0.019 |
| Edge Density |
0.064 |
| Mean Gradient Magnitude |
0.126 |
| Gradient Variance |
0.033 |
| Gradient Smoothness |
0.0 |
| Directional Coherence |
0.051 |
| Pattern Complexity |
0.138 |
| Pattern Repetition |
1.0 |
| Detail Frequency Ratio |
0.648 |
| Spatial Variation |
0.147 |
| Texture Consistency |
0.526 |
C) Brightness & Contrast Analysis
| Metric |
Value |
| Mean Brightness |
0.441 |
| Brightness Variance |
0.241 |
| Brightness Uniformity |
0.454 |
| Brightness Skewness |
-0.294 |
| Brightness Entropy |
7.22 |
| Rms Contrast |
0.241 |
| Michelson Contrast |
1.0 |
| Weber Contrast |
0.87 |
| Mean Local Contrast |
0.018 |
| Contrast Uniformity |
0.0 |
| Dynamic Range |
1.0 |
| Effective Dynamic Range |
0.682 |
| Shadow Percentage |
38.664 |
| Midtone Percentage |
42.984 |
| Highlight Percentage |
18.352 |
| Shadow Clipping |
0.001 |
| Highlight Clipping |
0.0 |
| Tonal Balance |
0.0 |
| Fine Contrast |
0.01 |
| Medium Contrast |
0.023 |
| Coarse Contrast |
None |
| Multiscale Contrast Ratio |
1.0 |
| Edge Contrast |
0.126 |
| Contrast Clustering |
0.474 |
D) Spatial Distribution Analysis
| Metric |
Value |
| Spatial Coherence |
0.75 |
| Color Clustering |
0.694 |
| Color Transition Smoothness |
0.674 |
| Transition Uniformity |
0.781 |
| Sharp Transition Ratio |
0.1 |
| Transition Directionality |
0.058 |
| Mean Saturation |
0.52 |
| Saturation Variance |
0.077 |
| Low Saturation Ratio |
0.285 |
| Medium Saturation Ratio |
0.355 |
| High Saturation Ratio |
0.36 |
| Saturation Clustering |
0.999 |
| Hue Concentration |
0.834 |
| Complementary Balance |
0.0 |
| Analogous Dominance |
0.865 |
| Temperature Bias |
0.867 |
Methodology
Computational analysis of a photograph of the artwork, reduced to 1,000 pixels on its longer side and filtered by a 3×3 median to remove grain. Colours: each pixel (sRGB rounded to 5 bits per channel) receives its Munsell notation and ISCC-NBS name from a table computed once from published data (Munsell renotation; ISCC-NBS blocks, NBS Special Publication 440, 1976), never from the artworks. Flat areas: connected regions of one name, merged with their neighbours while the CIEDE2000 difference between their mean colours stays below 10; an area is kept from 0.05% of the image; contrast with the surroundings measured 4 to 12 pixels from the edge. Texture: intensity standard deviation, local standard deviation, edge density (Canny), local binary patterns. Brightness: mean, variance, RMS, Michelson and local contrast, shadow / midtone / highlight distribution. Distribution: spatial coherence, transitions, saturation. Methods are deterministic and reproducible. Limits: the measurement concerns the photograph, including its lighting and white balance; two neighbouring areas less than 10 apart are merged.
